Protective sleeve



FIG. 1 is a perspective view showing our new design;

FIG. 2 is a back view of the design of FIG. 1;

FIG. 3 is a front view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a view of our design in an open configuration of the design of FIG. 1;

FIG. 8 is another view of our design in an open configuration of the design of FIG. 1; and,

FIG. 9 is another back view thereof.

The broken lines shown in FIG. 9 are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a protective sleeve, as shown and described. 